RENNtech ECU Hand Held Tuner (HHT) for CLK 500 C209 | 320 HP / 355 LB-FT | MY2003-2006 mercedes-benz-gls-class--167---2020-present--gls-450-esr7245365 After plugging the HSM into

After plugging the HSM into the OBD2 port

S550 (W222 | MY2014-2017 | 4MATIC | M278 | 4

The maximum power number reached with the RENNtech ECU Upgrade for the S63 AMG S 4MATIC+ is 740 HP and 806 LB-FT

RENNtech products are manufactured to perfectly match the stock G550 exhaust system

Rated by RENNtech:                402 HP @ 5

RENNtech ECU Hand Held Tuner (HHT) for CLK 500 C209 | 320 HP / 355 LB-FT | MY2003-2006 mercedes-benz-gls-class--167---2020-present--gls-450-esr7245365 After plugging the HSM intoRENNtech ECU HHT (HandHeldTuner) for the 209 CLK 500. Up to 320HP and 339 LB FT LB FT. Gains: +18HP & +16LB FT. RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU.